Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c74773dbed6e4a…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 06:53:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2ecd11f2c0c22b2aea27f14402b435e2 SHA-1: 8e921fccf4b7b6039e852985e95b3e146462d75e SHA-256: 99c74773dbed6e4acdc5ecdf0ea45ca58d6f39f56d4c5d2cb536c89b36f5cdbe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a lure for game hacks and redirects users to malicious infrastructure. The document body and embedded URLs promote 'free generators' and 'game hacks' for popular games like Roblox, which is a common social engineering tactic. The primary malicious URL identified is http://netcdn.tw/app/431946152/roblox-cheat-codes-game-hack, which is flagged as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/roblox-cheat-codes-game-hack In PDF document text
    • http://library.atim.ac.id/repository/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/cheat-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-android-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/robux-hack-synapse_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/cerberus-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-rs-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-robux-hack-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-how-to-hack-kohls-admin-house_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hack-avatar_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/sign-up-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-for-tasks_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-elemental-battleground-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E01 22392 bytes
SHA-256: 3e2e883776c288888347e890dd182a1d6ee3f3fd21a0847ef20ee5789a0b0a0f
font_01_sfnt_off0000602e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x602E 18932 bytes
SHA-256: a95ed2ebfaa41175af61b40c976dd9a66f12315416a1f48c3ae7e56a22336851

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